L.E. Wilson Neck Sizer Die Bushing .334 – Steel B-334

Description

This is the .334 steel bushing from L.E. Wilson, the interchangeable insert that drops into a Wilson neck sizing die or Wilson bushing-type full-length sizing die to control how tightly your case neck grips the bullet. Instead of relying on a one-size expander ball, you pick the bushing diameter that matches your brass and bullet combo, which keeps the neck more concentric and works the brass less. That translates to longer case life and the kind of repeatable neck tension precision handloaders chase.

It's machined from steel and holds its size through a lot of sizing cycles, so once you find the bushing that gives you the grip you want, it stays put. Wilson makes these in .001 inch increments, so you can build a small set and swap between cartridges or brass lots to fine-tune results. One handy detail worth knowing: the marked size refers to the middle of the bushing, which is reamed with a slight taper. Flip the bushing over so the markings face down and you'll get a touch tighter sizing, which comes in handy when brass work-hardens over time or you just want to nudge tension without jumping to the next smaller size.

Picking the Right .334 Wilson Bushing for Your Load

There are two common ways to land on your bushing size. The first is to measure the outside neck diameter of a loaded round with a good micrometer, then subtract .002 to .003 inch to account for brass spring-back. The second is to measure your neck wall thickness, multiply by two, add your bullet diameter, then subtract that same .002 to .003 inch. Either method gets you to roughly .001 to .002 inch of grip, which is the sweet spot for consistent seating.

Where the B-334 Bushing Fits

This bushing freely interchanges across Wilson bushing-type neck sizing dies, and it also works with Wilson bushing full-length dies. The die body itself is sold separately. If you're already running a Wilson bushing setup, this is a straightforward drop-in to get you to the .334 size.